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After starting all 16 games last season, Costa started the season
opener against the New York Giants but exited with a back injury after
the first series.

“Really what we have to do is just watch him and see what his health
is like, see what he is able to do,” Garrett said Monday. “He did a good
job trying to come back from that injury late in training camp and
going into that Giants game. We’re going to make sure he’s healthy first
and foremost. And if he is, we’ll make our next best evaluation from
there.”

Ryan Cook, who the Cowboys traded for on Aug. 31, has been the
starting center since Costa’s injury. Even if Costa is ready to play,
Garrett said there’s no guarantee that he will automatically regain his
starting spot.

“He’s been a good football player for us,” Garrett said of Costa. “He
was our starter going in. Ryan has done a good job coming in on short
notice and playing that position. The offensive line, just like every
position on our team, we’re going to create competition. We don’t have a
rule that says this guy was our starter and he got hurt and you can’t
lose your job due to injury. We don’t have any of those rules.

“We’re going to make our best decision. We want to see him practice,
see where he is and see what the best decision is going forward.”